sulfur dioxide; 3-chloro-benzenecarboperoxoic acid 1) 20 deg C, 16 h, 2) benzene, 20 deg C, 45 h; Yield given. Multistep reaction;

sulfur trioxide in 1,4-dioxane-d8 T=15°C; other substituted cyclopropane, other solvent; var. temp., time and reagent quantity; Product distributionMechanism;